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The single stage thruster geometry tested by Masuyama & Barrett [29, 30] consisted of a 32 AWG (0.202mm diameter) tinned copper wire emitter electrode and a 0.635cm diameter 6061 aluminum tube collector electrode (see figure 1-1). Both electrodes were 40 cm long. The d = 1 cm electrode spacing is investigated here first using the experimentally determined current-voltage characteristic in the homogeneous boundary condition equation (3.28) and then using the smoothed charge injection model given by equation (3.30). In this case the parallel wire coefficients from table 1.1 are more appropriate for equation (1.3); the critical electric field strength is Eo e-~ 12 1. 1 kV/cm. re c11 7-7j- rc2 Figure 3-3: Dual stage thruster geometry. & Figure 3-3 illustrates the dual stage thruster geometry tested by Masuyama Barrett [29, 30]. The intermediate electrode is a single strand 4 AWG (5.189 mm diameter) solid copper wire. The emitter electrode and collector electrode are the same as the single stage case. The electrode spacings di = 1 cm and d 2 = 3 cm are investigated in the present work. The applied voltage V2 is maintained at 20 kV while V1 is varied. 48

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